Roll grinding machine



A. P. STEINER ET AL I ROLL GRINDING MACHI NE Filed Aug. 29, 1929 July 9, 1935.

' 7 Sheets-Sheet l grwnt ozd Amad 1. Steiner Haro/dlffia Zdzyer .July 9, 1935. A. P. STEINERQ El AL.

ROLL GRINDING MACHINE Filed Aug. 29, 1929 7 Sheets-Sheet '2 gwomtou Amoo PSfeiner A/A/ RA fiaroldEBa/diger July 9, 1935. A, P. ISTEINER Er AL 2,007,351

ROLL GRINDING MACHINE Filed Aug. 29, 1929 7 sheetssheet s I gmnntotd I AmodP Sieinen Ham/dEBa [4190' i 1935- w A. P. STEINER ET AL 2,007,351

ROLL GRINDING MACHINE Filed Aug. 29,1929 '7 Sheets-Sheet 4 gwoantou Amod P Sieinr zflnmldll'fialfiger July 9, 1935. A.- P. STEINER 'Er AL 2,007,351

ROLL GRINDING MACHINE Filed Aug. 29,-1929 '7 Sheets-Sheet 5 a h I 'INVENTORS fimoa P J/ainez:

BY [l ama] EBa/i er:

' TTORNE S.

- July 9, 1935. A. P. STEINER ET AL ROLL GRINDING MACHINE Filed Aug. 29, 1929 7 Sheets-Sheet 6 INVENTOR HMOS 5 1mm B HHROLD E. BHLSIGERY ATTORNEY July 9, 1935- A. P. STEINER ET AL ROLL GRINDING MACHINE Filed Aug. 29, 1929 7 Sheets-Sheet 7 R W m 7 or w qAnmv EBHLSIGER Patented July 9, 1935 -Waynesboro, Pa... acorpo'ration of Pennsyl- This invention relates tdmachines for grind-f 1 ing the surface oi isteelmill rolls andwork of similar character and is, designed for producing a crown or convex surface on the work; In carrying out the invention particular attention is paid connection more clearly.:

tothe-means for grinding a convex-curveto provide fondefiection oithe roll under a leader a concave curve which will compensate for expansion of the roll due to-heatr; v A further object; is to provide'meansion taking up all lost motion between the. driving; elements and the roll and to eliminatejback"lash; in the gearing of the crown and concaving mechanisms. Referring to the accompanying;drawings which a ad a a her and v w i h'e mi er reference characters indicate similar parts j Figure 1 is an-end elevation of amachine pn which our device is mounted with a section broken away to showthe drivingmeans of -the; .several p Y 1;:

Figure 2 is an end elevation of the wheel: base w t parts r k n w y s lt e ea in t the crowning and concav-ing mechanism and the wheel feed, j ,Figure 3 is a'plan view of; the Wheel base with parts broken away to show the gearingshownin; u l. if-" Figure 4 is arear viewoif the wheel base showing the toggle arms formoving the wheel baseto produce the crown or concavity on the work,

, Figure 5 is a sectional view of thecrank shaft and acrankpin taken on line 5-.-5 of .Figure g Q .Figurefi is a section onlinev 6-6 ofFig. 3;; Figure 7 is a'detail sectional viewof'a -n1odi fled form of back lash eliminating means in which back lash is automatically taken-um, ,1 Figure 8 is an end view showing the .iianged portion of a spindle for operatingthewheel base oscillating mechanism,

Figure 9 is a section; on' line Gi t! of Figure 8, Figure 10 is a diagrammatic sketch-showing the method of developing. the; 'curves .formed in grindinga convex or-concave surface ,on a;cy1ing-; dricalwork piece;

j Figure lllis a furtherdiagrammaticview rep,- resenting the surface of a crowned roll 011110011- cave roll inwhich the curve is :developed from that plotted directly from the dial readingsiyas given'in Fig." 10. V

means forthe work carriage and that for-operatthe .relationbetween theparts butwith the; seve eral parts out of their. actual position to showzthe,

. Figure .12 is a development of Figure '13 section on line l-3l3 of Figure 1f is,a detai1 sectional view of one ofthe l tche -Z. v .11. j Qur. invention" consists primarily of mechanism ior moving a grinding wheel of a roll grinding machine toward and from the work piece in-such a ;way astoproducearegular crowned or concaved suriace on the roll, Means are provided to. reproduce the curve formed by a straight roll roll asit becomes heated. In designing our .deviee. the; deflection or expansion of the roll is predetermined xand the mechanism designed to compensate; fgr such deflection or expansion;

wlnthe drawings numeral I0 indicates the bed-of a roll grinding machine having a work'carriage .ll upon whichis mounted the work l2 here shown as a large- 13011, the work being held between head stocks and tailstocks of the usual construction of which the latter alone is shown at I3; The work may be driven in any suitable way asby a motor .l4 operating through suitable reduction gearing, not shown. H A fgrinding wheel l5is mounted upon a .wheel base lG which is pivoted at it! upon a-sub-slide Hi which sub-slide ismounted upon the bed of the machine and may be moved toward and from the work 12. The grinding wheel is driven from a motor "through suitable belts not shown. The grinding wheelbase It may be moved upon the sub-slide by the iollowing mechanism: A vertical shaftflihas on its lower end a bevel'geariflwhich meshes with a corresponding bevel gear 21; on a screw 22.; A horizontal shaft enclosed in acasing -2 3 has a bevelgear meshingwith abevel gear on-the upper end'of the shaft 19, not shown. A handwheel 24 provides manual means forrotating the shaft l9 to move the wheelbasetoward and; fromithe grinding wheel. Power means for. moving the grindingwheel toward and, from the workcomprises a motor? 25 and speed reducing means shownas a whole at 26 by means of which the shaft-l9 is rotatedto move the grinding wheel-toward and'from the.work.; The wheel. feed mechanism'just described is similar in most respectstothat ,in;well -known grindingmachines and willnot beiurtherdescribedhre. 1:

'Means; for swinging the wheel base onrits pivot I] will now be described. This consists v,of a pair of spindles Hand-'28 each;having on its outerend a iiange29. This flange has an annular slot 30 iFigs. 5, 8, 9); .Crank pins 3! and 36 are secured to the ,flang ed portions byfm'eans :o f-

bo1ts32. Th e1heads of the. boltsengagein: the

' under load onto provide'for; the expansion of the slot 38 so that the crank pins may be rotated about the flanges on the shafts 21 or 28. The bolts 32 pass through a flanged portion 33 on the end of the crank pins 3| and 36. These latter flanged portions have suitable graduations as shown at 34. The reasons for the graduations and the adjustability of the flange portions 33 with respect to the flange 28 will later appear.

Toggle arms 31 and 38 are mounted on the crank pins 3| 'and 36 respectively. The upper ends of these toggle arms are pivotally connected to a pin 38 on which is mounted a roller 48.

The roller 48 engages beneath theouter end of a bracket 4| mounted on the top of the wheel base l6. 1

From the construction just described it will be seen that rotation of the shafts 21 and 28 will rock the wheel base l6 on its pivot H.

The spindles 21 and 28 are driven from the same drive as the work carriage is driven. The driving mechanism is as follows: The shaft 42 is directly driven by a suitable motor. A pinion 43 on this shaft drives a pinion on a shaft 45. A pinion 46 on shaft 45 drives a gear 41 loosely mounted on a shaft 18. A hub 88 made integral with the gear 41 has gear teeth out therein which mesh with a gear 8| loosely mounted on a shaft 82. The shaft 82 has a pinion 83 on one end which drives'a rack 84 on the work carriage The pinion has clutch teeth on one side which are engaged by lugs 86 on the shaft 82. Acertain predetermined clearance is provided between the lugs 86 and the clutch teeth 85. Loosely mounted on the shaft 82 is a gear 81 which meshes with a gear 88 on the shaft-18. The gear 88 has a hub gear 88 which meshes with a gear 88 keyed to the shaft 82. The gear 88 drives 'a gear 8| on the shaft 48. The gear 8| has clutch teeth 82 which mesh with clutch teeth 83 on the gear 81 when the gear 8| is moved against the gear 81. The work carriage may be driven through gears 43, 44, 46, 41, 88,- 8|, clutches 84, 86, 85, pinion 83 to rack 84, or when the gear is moved axially to the right the drive is through gears 88, 8|, clutches 82, 83, gears 81, 88, 89, 88, shaft 82, clutch lug 86, clutch teeth 85, pinion-83 to rack 84. The latter provides a slow speed drive for the work carriage. A clearance is provided at' 85 between the lugs 86 on the shaft 82 and the teeth 85 on the pinion 83, so as to provide a lost motion between the driving gears described and the rack 84. This clearance is made to take care of the lost motion between the pinion 88 and the shaft 58 later to be described, so that the pinion 83 will start movement of the rack 84 just as-the shaft '58 begins to rotate. The clearance 85 therefore compensates for lost motionbetween gear 88 and worm shaft 58. The shaft 48 is drivenby means of pinion 58 on shaft 48, pinion 52 on shaft 48 and an intermediate pinion 5|. The relative sizes of the pinions 58, 5| and 52 determine the relative speeds of the shafts 48 and 48. These pinions may be removed and pinions of other sizes substituted to vary the speed of the shaft 48. The shaft 48 has a bevel gear 53 keyed thereto and slidably mounted thereon. The gear 53 meshes with a bevel gear 54 on a shaft 55 mounted in a bracket 56 which is secured to the lower side of the sub-slide l8. The shaft 55 has a bevel gear 51 on its upper end which meshes with a bevel gear 58' on a shaft 58. This shaft has worms 68 and 6| thereon which mesh with worm wheels 62 and 63 on the shafts 21. and "respectively. Shafts 21 and 28 have also gears 64 and 65 each of which meshes with an idle gear 66. From the construction just described it will be seen that as the work carriage II is reciprocated the spindles 21 and 28 are rotated and that reversing the work carriage reverses the rotation of the spindles. In order that the crowned or concaved surface of the roll may be accurate it is necessary to eliminate all lost motion between the'driving mechanism connected to the work carriage and the driven spindles 21 and 28. Means for doing this is shown in detail in Figures 6 and '7, Figure 6 showing manual means for taking up back-lash and Figure '7 showing automatic means for accomplishing the same purpose. The hub of the gear 65 is provided with sockets for receiving set screws 61 and 68 which screws seat in sockets 68 and 18 cut in the spindle28. Lost motion may be taken up by loosening screw 68 and tightening screw 61. By turning down screw 61 and loosening screw 66 a relativemovement between the gear 65 and the shaft 28 is produced, this gear tending-to rotate in a clockwise direction as viewed in Figure-6 and the shaft 28 in a counterclockwise direction. The counterclockwise rotation of the shaft 28 turns worm gear 63 to take up back lash between said gear and the worm 6|. when said worm is driving said worm gear is moved in a clockwisedirecticn, that is, in a direction to rotate shaft 28 in a clockwise direction'as viewed in Fig. 6. The tendency of gear 65 to rotate in a clockwise direction turns the gear 66 in'a counterclockwise direction which rotates the gear 64 in a clockwise direction. The gear 64 in turn rotates the shaft 21 in a clockwise direction, as shown in Figure 6, to rotate the worm gear 62 to take up back lash between this gear and the worm 68.

It will be seen that adjusting-screw 61 causes Worm wheels 62 and 63 to rotate in opposite directions, thus tending to move the worms 68 and 6| toward each other so that when said shaft 58 turns in a given direction one worm drives the toggle arms through one of the shafts and when it rotates in the other direction the other worm drives the other shaft to drive the toggle arms. In other words the driving connection between the traverse carriage and the toggle arms is always through one of the shafts 21 or 26 while the other idles. When the work carriage moves in the opposite direction the driving is through the other shaft so that the driving connection'is'always through-one shaft 'while the other idles. Since the back lash is taken up in both directions all lost' motion-will be eliminated between the driving'mechanism and the driven mecha'nism which is the toggle arms which operate to swing the wheel base on its pivot to move "the grinding wheel towardand fromthe 'work.

In Figure! is shown automatic mechanism for' taking up lost motion. In this case the hub of the wheel 65' is provided with a bushing 1| and a set screw 12 is screwed into the bushing so that its end rests against the bottom of a socket 13 in the shaft 28. The outer end of the bushing is enlarged to receive a spring 14, one end of which is secured in the bushing and the other end in a collar 15. The collar is secured to the screw-12' by means of a set screw 16. The spring 14 is tensioned by rotating the collar 15 and securing it in position by means of set screw 16. Asmall clearance is allowed between the collar 15and the top of. the bushing 1| and the spring 14 tends to 'rotate the screw 12' to keep its end tightly against thebottoin of the socket 13. It will be seen therefore that thetendency of thespring 14 is always to rotate the screw 12 to rotate the a garafiS .tinca clockwise. the shaft 2 aam aicounterclockwise direction. The

direction I and to .rotate gear 65'1and shaft 28 will bothtr'otate until they haveie'liminalted all lost. motion between the worm gears Bil-and .63and the corresponding wbr'mszBO and 6 I 1011- the 'Sha-Tti59 as. described above with respectto'the device asxfshown in Fig. 6.*

,A 'screwilfi operated bya lever'l'll is threadedthrough the top of the wheel base and maybe screweddoiwn. to irhaveiits lower end rest upon a plate 18 secured'to" a" portion of the sub-slide. The

, purpose of thisscrew is to'remove the weight of the wheel base from the rolls 40.

The operation of the machine is as follows:

The grinding operation should begin with the grinding wheel at the center of thework piece to be crowned or concaved. The weight of the wheel base I 6 is removed from the roller 40 by the screw 15. The crank pins 31 and 36 are then frotated by shifting the dials 32 until the mark-v crank pin rotated clockwise to get the correct starting position for crowning. For concaving the dials are shiftedgin the opposite direction.

The dials are preferably graduated in degrees and by means of a chart the operator may determine the correct setting for a given roll. The spindles 21 and 28 carrying crank pins 3! and 36 are retated by gearing connection from the mechanism which drives the work carriageashas been described. Movement of the carriage in one direction rotates the shafts 2! and 28 in one direction and reversing the carriage reverses the rotation of these shafts. As the shafts tend-to rotate they liftthe wheel base It torock it on its pivot H. The rocking of the wheel base and the movement of the work carriage are so timed that the correct crown or correct concavity is ground by the grinding wheel.

' In Figures and 11 the operation of the device is shown somewhat:diagrammatically. In these figures the zero or straight line setting of the dials is shown by arrows in Figure 10' at a point 30 degrees above the horizontal in a clockwise direction for dial X and in a counterclockwise direction for dial Y. Shifting the dials so as to bring the zero mark above the straight line setting establishes a setting for grinding a concave roll. Thesetting for grinding a crowning surface is obtained by shifting, the dials to bring the zero mark below the straight line setting. As further shown in Figure 10, the figures indicate the development of the crowningv surface and the letters the concaving surface. The two curves shown in the drawings in Figure 11 are drawn out to represent the surfaces of a crowned roll and a concaved roll, the points being transferred from those plotted directly from the dial readings. These two views are rather diagrammatic but serve to show how the curves are developed and further show that an adjustable throw crank shaft or eccentric is not necessary for grinding. crowned or concaved surfaces of a roll. Of

course in operation the crank pins rotate atthe 1 same speed and in the same direction. It should be noted that the worm Bl drives the wormwheel 63 and the worm 60 drives the'worm wheel 62. The driving, therefore, is always through only one of the worms at a time, the teeth of the lother wormbeing meshed opposite so that the worm wheel idles. For instance if the worm 6| is driving the worm wheel 63, the. shaft 28 will be driven in azcounterclockwise direction as shown inzlFigure 56.;=Power is also delivered through gear B5,.idle;gear 66 to gear 64 and the shaft 21 to rotate this shaft likewise in a counterclock- Wise.directiontooperate the crank pins 3 l and 36 and swing: the togglegarms to tilt the wheel base lfitoward and away from the work. While the carriage-is. moved in this direction "the worm 62 is doingznowork; however, as soon as the carriage is reversed the. :worm' 60 takes up the load and drives theshaft. 211 through .1 the worm wheel B2 and the motion is repeated in the opposite direction with the worm 63 idling. Reversing ofthe work carriage therefore causes an instant driving of the toggle links which swing the wheelbase 'on its pivot. In crowning, the dials and hence the crank pins are positioned as described above. Assuming that the carriage moves first to the right the grinding wheel being at the center of the roll the crank pins rotate in a clockwise direction lifting the roll and tilting the wheel l4 toward the work until the end of the roll is reached and the carriage and crowning mecha-' nism are reversed. The wheel then tilts away from the work until it passes the center at which point it is furthest from the axis of the work piece and then moves toward the work until the other end of the roll is reached. Inconcaving the wheel tilts away from the work as it moves from the center toward the end.

It will be obvious to those skilled in the art" that various changes may be made in our device without departing from the spirit of the invention and therefore we do not limit ourselves to what is shown in the drawings and described in the specification, but only as indicated in the appended claims.

Having thus fullydescribed our said invention,

what we claim as new and desire to secure by Letters Patent, is: i

1. In a machine of thekind described, a work support, a wheel support, means to provide relative transverse andlongitudinal movement between said supports, means to effect said movements simultaneously comprising a system of gears to effect said transverse movement, another system of gears to effect said longitudinal movement, common driving means for both systems, and means to provide lost motion at the end of one system to correspond to the difference in back lash in the two systems.

2. In a machine of the kind described, a work support, a tool support, means to effect relative transverse and longitudinal movement between said supports, means to initiate said movements simultaneously comprising mechanism to effect said transverse movement, another mechanism to effect said longitudinal movement, common driving means for both mechanisms, and means to provide lost motion in one mechanism to correspond to the difference in back lash in the two mechanisms.

3. In a machine of the kind described, a work support, a tool support, a crowning and concaving mechanism for causing a relative movement between said supports in adirection substantially perpendicular to the work surface comprisinga "pair of shafts, each shaft having a gear mounted thereon eccentricelements on each of said shafts and adapted to rotate therewith, means engaging one of said supports and adapted to be actuated by both said eccentric'elements to effect said relative movements, means. to rotate said eccentric elements in synchronism comprising an adjusting screw mounted in one of said gears and adapted to bear against a portion of the shaft to effect rotation between said gear and said shaft and automatic means to maintain said screw in contact with said shaft.

H 4. In a machine of the kind described a bed, a work support and a tool support mounted there on, a crowning and concaving mechanism for causing a relative movement between said supports in a direction substantially perpendicular to the work surface comprising a pair of shafts extending outside the bed, driving means for said shafts, means to rotate said'shafts synchronously, flanged portions on the extended end'of each shaft, discs adjustably secured to each of said flanged portions, each of said discs having a pin eccentricaily positioned thereon and on the oppo- 

